Sanyo C21LF41B Service Manual

SERVICE MANUAL Colour Television

Product Code: 13007604
13007605

Original Version

Chassis Series: LA6-A

BC2E

FILE NO.

Model No. C21LF41
C21LF41B

Service Ref. No. C21LF41-00
C21LF41B-00

(Argentina)

Give complete “SERVICE REF. NO.” for
parts order or servicing. It is shown on the
rating plate at the cabinet back of the unit.

This T.V. receiver will not work properly in
foreign countries where the television trans­mission system and power source differ from
the design specifications. Refer to the speci­fication table.

Specifications

Power Source . . . . . . . . . AC220V, 50Hz / 60Hz

Receiving System . . . . . . PAL (M/M, N/N), NTSC (M/M)

Channel Coverage

Antenna mode VHF: CH02-CH13, UHF: CH14-CH69

CATV mode VHF band: CH01-CH13, Mid band: CH14-CH22

Super band: CH23-CH36, Hyper band: CH37-CH64
Ultra band: CH65-CH94 and CH100-CH125

Low mid band: CH95-CH99
Aerial Input Impedance . . 75Ω
Input Terminals
AV1 (Video): Phono jack ✕ 1
AV1 (Audio): Phono jack (R/L) ✕ 1 set
AV2 (Video): Phono jack ✕ 1
AV2 (Audio): Phono jack (R/L) ✕ 1 set
Output Terminals
Video Monitor Output: Phono jack ✕ 1
Audio Monitor Output: Phono jack (R/L) ✕ 1
Headphone Jack: Mini stereo jack ✕ 1

Sound Output (RMS) . . . . 3W + 3W

Speakers . . . . . . . . . . . 5cm x 9cm x 2 pcs.

Dimensions . . . . . . . . . 596(W) X 493(H) X462(D) mm

Weight . . . . . . . . . . . . . approx. 22 Kg

Specifications subject to change without notice.

JXMRR

P

O

W

E

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Contents

-2-

Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Chassis Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

IC Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

Service Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-17

Purity and Convergence Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Chassis Electrical Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-26

Safety Notice

SAFETY PRECAUTIONS

1: An isolation transformer should be connected in the

power line between the receiver and the AC line
when a service is performed on the primary of the
converter transformer of the set.

2: Comply with all caution and safety-related notes

provided on the cabinet back, inside the cabinet, on
the chassis or the picture tube.

3: When replacing a chassis in the cabinet, always

be certain that all the protective devices are
installed properly, such as, control knobs, adjust­ment covers or shields, barriers, isolation resistor­capacitor networks etc.. Before returning any
television to the customer, the service techni­cian must be sure that it is completely safe
to operate without danger of electrical shock.

X-RADIATION PRECAUTION

The primary source of X-RADIATION in television receiver is the picture tube. The picture tube is specially con­structed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must
be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazard­ous X - RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer
to this service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified
limits, take necessary corrective action. Carefully follow the instructions for + B1 volt power supply adjustment,
and high voltage check to maintain the high voltage within the specified limits.

PRODUCT SAFETY NOTICE

Product safety should be considered when a component replacement is made in any area of a receiver.
Components indicated by mark in the parts list and the schematic diagram designate components in which

safety can be of special significance. It is particularly recommended that only parts designated on the parts list
in this manual be used for component replacement designated by mark . No deviations from resistance

wattage or voltage ratings may be made for replacement items designated by mark .

Chassis Block Diagrams

-3-

AERIAL

KEY SW

R/G/B

CRT

39

12

R

CRT DRIVE

26 13 G

+180V

14

B HV/Fo/Sc

R/C PRE-AMP

TUNER

BUS

21

H-OUT

DY-H

(LA76931A

IF V

-

Y

D

)

3

3

9

6

7A

L

r

o

HORIZ-DRIVE HORIZ-OUT

SAW FILTER

44

FBT PULSE

AV1

46

SUSOC

AV2 54

VIDEO SW-AUDIO SW

17

V-OUT (LA78041

MONITOR OUT

VIDEO 52

F.B.

/ LA78040)

MONITOR OUT AUDIO VERT-OUT

BUS

5

FM

NVM

AC220V (SANKEN)

AUDIO

SPEAK(L)

L/R L

(CXA2234QP)

WF (LA42032

R

/LA42031) SPEAK(R)

POWER AUDIO-OUT

63/64

STR-W6754

/STR-W675

3

38/39

+9VA(AUDIO)

+9VA

MAIN SIGNAL PROCESSING CIRCUIT

Chassis Block Diagrams

-4-

POWER SUPPLY IC (STRW6753)

FUNCTIONAL BLOCK DIAGRAM

IC Block Diagrams

-5-

IC201 < IF/Video/Chroma/Def./CPU > LA76931

IC Block Diagrams

-6-

1

2

3 4 5 6 7

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I

N V E RT I N G I N P UT

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c

P U M P U P O UT

P ump

U

p

+

-

AMP

T hermal
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IC Block Diagrams

-7-

IC3401 <MTS> CXA2234QP

-8-

Service Adjustments

M

E

N

U

t

C

H

s

-

V

O

L

U

M

E

+

MENU

MENU

S1.11100101 S2.11111000
ADDRESS DATA
02 H-PHA 08

Item No.

Item

Data value

General

This set has an On-screen Service Menu system included in the CPU that allows remote operation for most of the
service adjustments.

2. Service Adjustments:
Press the CHANNEL UP or CHANNEL DOWN

button on the remote control handset to select the

desired service menu item you want to adjust.

Use the VOLUME + or - to adjust the data. The + or

- button will increase or decrease the data
sequentially.

3. Exit from the Service Menu
Press the MENU button to turn off the Service Menu

display.
The data which is set in the service mode is stored
into the memory IC automatically.

[ Service Mode Display ]

Service Adjustment-1

1. Enter the Service Menu
While pressing the MENU button on the television, press the Number Key 2 on the remote control unit.

The Service Menu now appear.

IC802 (EEPROM) Replacement

When IC802 (EEPROM) is replaced, IC801 (CPU) will automatically write the initial reference data into IC802 for basic TV operation.
However, the bus data should be checked and some bus data should be set up before attempting the service adjustments. (See
pages 9 ~ 10 for detailed information.)

VOLUME +

VOLUME

-

CHANNEL UP

CHANNEL DOWN

-9-

Service Adjustments

On-screen Service Menu

Following table shows the initial values which have been stored in the CPU ROM, and items for the service adjustments.
When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. The shaded menu should be
checked and be set up or readjusted according to the procedures described in the following pages.
Initial Setup Data marked with an * should be changed from Initial Value Data.

No Item Initial value Range Description

1 RFAGC 13 00~63 RF AGC adjustment
2 H-PHA 12 00~31 H-PHASE adjustment(50Hz)
3 V-DC 28 00~63 V-POSITION adjustment(50Hz)
4 V-SIZ 79 00~127 V-SIZE adjustment(50Hz)
5 V-SCO 18 00~31 Vertical-S compensation(50Hz)
6 V-LIN 15 00~31 Vertical linearity adjustment(50Hz)
7 H-P60 +3 -16~+15 Difference value of H-PHASE adjustment(60Hz)
8 V-P60 0 -32~+31 Difference value of V-POSITION adjustment(60Hz)
9 V-S60 0 -64~+63 Difference value of V-SIZE adjustment(60Hz)

10 VSC60 0 -16~+15 Difference value of Vertical-"S" compensation(60Hz)

11 VLI60 0 -16~+15 Difference value of Vertical linearity adjustment(60Hz)
12 OSDHP 37 01~255 OSD horizontal remark position
13 OSDC 04 00~07 OSD Contrast
14 V-SCP 03 0~7 V-SIZE COMP
15 SBIAS 31 00~127 Sub Bias adjustment
16 RBIAS 00 00~255 Red Bias adjustment
17 GBIAS 00 00~255 Green Bias adjustment
18 BBIAS 00 00~255 Blue Bias adjustment
19 RDRIV 64 00~127 Red Drive adjustment
20 GDRIV 08 00~15 Green Drive adjustment
21 BDRIV 64 00~127 Blue Drive adjustment
22 White balance (a lateral line)
23 DRV Bright and Dark of White balance adjustment
24 B-YD 11 00~15 B-Y DC Level
25 R-YD 11 00~15 R-Y DC Level
26 B-YDN 0 -16~+15 Difference value of NTSC B-Y DC Level
27 R-YDN 0 -16~+15 Difference value of NTSC

R-Y DC Level

28 G-YA 00 00~01 G-Y Angle
29 RBGB 10 00~15 R-Y/ B-Y Gain Balance

30 RBAG 08 00~15 R-Y/ B-Y Angle
31 G-YAN 00 00~01 NTSC G-Y Angle

32 RBGBN -8 -8~+7 Difference value of NTSC R-Y/ B-Y Gain Balance
33 RBAGN +4 -8~+7 Difference value of NTSC R-Y/ B-Y Angle
34 COGV 03 00~03 Coring Gain

35 BLKS 00 00~03 Blk.str.start(W/Defeat)